[yocto] SPI0 dev loop back = 000 ? why ?

[Riko Ho]

Hello Yocto Team Member,

I tried to compile spidev_test  on loopback ,but got 0000, why is it ?? 
I checked all the cable and /dev/spidev1.0, they're all there ??

spi mode: 0
bits per word: 8
max speed: 2400000 Hz (2400 KHz)

00 00 00 00 00 00
00 00 00 00 00 00
00 00 00 00 00 00
00 00 00 00 00 00
00 00 00 00 00 00
00 00 00 00 00 00
00 00

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Kind regards,
Riko Ho
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